I used redwood 2x2' for stakes and used pressure treated 4x4' for the end posts. Instead of putting posts at each end I ran the trellis wire into the block wall.
Our grapes came basically as 18" sticks with some roots at the bottom
all wrapped in a plastic bag. Interestingly, most of the vine goes under
ground. I was told that this whole part will develop into a root ball
and make a stronger rooted plant. We have about 3-4" sticking out at the
moment. We will be excited with they start budding and we know that
they are alive.